NXC  Version 1.2.1 r5
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string I2CDeviceId ( byte  port,
byte  i2caddr 

Read I2C device identifier.

Read standard I2C device identifier. The I2C device uses the specified address.

portThe port to which the I2C device is attached. See the Input port constants group. You may use a constant or a variable. Constants should be used where possible to avoid blocking access to I2C devices on other ports by code running on other threads.
i2caddrThe I2C device address.
A string containing the device identifier.
ex_i2cdeviceid.nxc, ex_i2cvendorid.nxc, and ex_i2cversion.nxc.